diff options
Diffstat (limited to 'net/ethtool/privflags.c')
| -rw-r--r-- | net/ethtool/privflags.c | 136 |
1 files changed, 136 insertions, 0 deletions
diff --git a/net/ethtool/privflags.c b/net/ethtool/privflags.c new file mode 100644 index 000000000000..169dd4a832f6 --- /dev/null +++ b/net/ethtool/privflags.c @@ -0,0 +1,136 @@ +// SPDX-License-Identifier: GPL-2.0-only + +#include "netlink.h" +#include "common.h" +#include "bitset.h" + +struct privflags_req_info { + struct ethnl_req_info base; +}; + +struct privflags_reply_data { + struct ethnl_reply_data base; + const char (*priv_flag_names)[ETH_GSTRING_LEN]; + unsigned int n_priv_flags; + u32 priv_flags; +}; + +#define PRIVFLAGS_REPDATA(__reply_base) \ + container_of(__reply_base, struct privflags_reply_data, base) + +static const struct nla_policy +privflags_get_policy[ETHTOOL_A_PRIVFLAGS_MAX + 1] = { + [ETHTOOL_A_PRIVFLAGS_UNSPEC] = { .type = NLA_REJECT }, + [ETHTOOL_A_PRIVFLAGS_HEADER] = { .type = NLA_NESTED }, + [ETHTOOL_A_PRIVFLAGS_FLAGS] = { .type = NLA_REJECT }, +}; + +static int ethnl_get_priv_flags_info(struct net_device *dev, + unsigned int *count, + const char (**names)[ETH_GSTRING_LEN]) +{ + const struct ethtool_ops *ops = dev->ethtool_ops; + int nflags; + + nflags = ops->get_sset_count(dev, ETH_SS_PRIV_FLAGS); + if (nflags < 0) + return nflags; + + if (names) { + *names = kcalloc(nflags, ETH_GSTRING_LEN, GFP_KERNEL); + if (!*names) + return -ENOMEM; + ops->get_strings(dev, ETH_SS_PRIV_FLAGS, (u8 *)*names); + } + + /* We can pass more than 32 private flags to userspace via netlink but + * we cannot get more with ethtool_ops::get_priv_flags(). Note that we + * must not adjust nflags before allocating the space for flag names + * as the buffer must be large enough for all flags. + */ + if (WARN_ONCE(nflags > 32, + "device %s reports more than 32 private flags (%d)\n", + netdev_name(dev), nflags)) + nflags = 32; + *count = nflags; + + return 0; +} + +static int privflags_prepare_data(const struct ethnl_req_info *req_base, + struct ethnl_reply_data *reply_base, + struct genl_info *info) +{ + struct privflags_reply_data *data = PRIVFLAGS_REPDATA(reply_base); + struct net_device *dev = reply_base->dev; + const char (*names)[ETH_GSTRING_LEN]; + const struct ethtool_ops *ops; + unsigned int nflags; + int ret; + + ops = dev->ethtool_ops; + if (!ops->get_priv_flags || !ops->get_sset_count || !ops->get_strings) + return -EOPNOTSUPP; + ret = ethnl_ops_begin(dev); + if (ret < 0) + return ret; + + ret = ethnl_get_priv_flags_info(dev, &nflags, &names); + if (ret < 0) + goto out_ops; + data->priv_flags = ops->get_priv_flags(dev); + data->priv_flag_names = names; + data->n_priv_flags = nflags; + +out_ops: + ethnl_ops_complete(dev); + return ret; +} + +static int privflags_reply_size(const struct ethnl_req_info *req_base, + const struct ethnl_reply_data *reply_base) +{ + const struct privflags_reply_data *data = PRIVFLAGS_REPDATA(reply_base); + bool compact = req_base->flags & ETHTOOL_FLAG_COMPACT_BITSETS; + const u32 all_flags = ~(u32)0 >> (32 - data->n_priv_flags); + + return ethnl_bitset32_size(&data->priv_flags, &all_flags, + data->n_priv_flags, + data->priv_flag_names, compact); +} + +static int privflags_fill_reply(struct sk_buff *skb, + const struct ethnl_req_info *req_base, + const struct ethnl_reply_data *reply_base) +{ + const struct privflags_reply_data *data = PRIVFLAGS_REPDATA(reply_base); + bool compact = req_base->flags & ETHTOOL_FLAG_COMPACT_BITSETS; + const u32 all_flags = ~(u32)0 >> (32 - data->n_priv_flags); + + return ethnl_put_bitset32(skb, ETHTOOL_A_PRIVFLAGS_FLAGS, + &data->priv_flags, &all_flags, + data->n_priv_flags, data->priv_flag_names, + compact); +} + +static void privflags_cleanup_data(struct ethnl_reply_data *reply_data) +{ + struct privflags_reply_data *data = PRIVFLAGS_REPDATA(reply_data); + + kfree(data->priv_flag_names); +} + +const struct ethnl_request_ops ethnl_privflags_request_ops = { + .request_cmd = ETHTOOL_MSG_PRIVFLAGS_GET, + .reply_cmd = ETHTOOL_MSG_PRIVFLAGS_GET_REPLY, + .hdr_attr = ETHTOOL_A_PRIVFLAGS_HEADER, + .max_attr = ETHTOOL_A_PRIVFLAGS_MAX, + .req_info_size = sizeof(struct privflags_req_info), + .reply_data_size = sizeof(struct privflags_reply_data), + .request_policy = privflags_get_policy, + + .prepare_data = privflags_prepare_data, + .reply_size = privflags_reply_size, + .fill_reply = privflags_fill_reply, + .cleanup_data = privflags_cleanup_data, +}; |